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Full text of "The Flow Of Gases In Furnaces"

238

APPENDIX VII

reduce the temperature of the outgoing gases.    The precedent
of this design has been followed in other cases.

There is a considerable diversity of opinion in regard to the
manner in which waste-heat boilers should be rated. In America
boilers are usually rated at 10 sq ft (0.933 m2) per horsepower,
which is equivalent to an evaporation of 3 Ib (14.6 kg) per square
meter of heating surface. Some have considered that this rating
should be reduced to 7.30 kg for waste-service service, in spite
of the fact that many boilers are in service at rates of evaporation
considerably in excess of the above figures. When it comes to the
selection of a boiler for any given waste-heat installation a con-
sideration of some of the installations which have been made
indicates wide differences in regard to the area of heating surface
required.

WASTE HEAT BOILERS INSTALLED ON OPEN-HEARTH FURNACES
(Thomas B. Mackenzie, Iron, and Steel Institute, 1918)


	I
	III
	V
	VII
	IX

Nominal capacity of furnace, tons ...........  .....
	30
	45
	100
	60
	60

Heating surface, * sq m ..... Economizer heating surface, so m ............
	151.00 66.2
	170.00 89 4
	204.00 111.9
	204.00 111 9
	204.00 111 9

Steam pressure, absolute, per so cm, ke:
	7 14
	8 35
	5 20
	6 18
	8 64

Feed water, initial temp .... Feed water, final temp .....
	11.6
 117.8
	6.95 120.6
	40.8 133 5
	9.5 133 00
	29.3 129 00

Gas temperatures, deg. C.: Entering boiler
	504 00
	585 00
	422 00
	577 00
	439 00

Leaving boiler ...
	254 00
	273 00
	232 00
	303 00
	304 00

Drop in boiler .........
	250.00
	212.00
	190.00
	274 00
	135 00

Leaving economizer ......
	169.00
	182.00
	184.00
	172 00
	264 00

Drop in economizer
	84 00
	91 00
	48 00
	131 00
	40 00

Draft in mm of water : At boiler inlet .........
	
	23 00
	40 00
	25 00
	25 00

At boiler outlet .........
	
	62.00
	78 00
	63 00
	95 00

Drop through boiler
	
	39 00
	38 00
	38 00
	70 00

At draft fan
	20 00
	87 00
	80 00
	76 00
	146 00

Drop through economizer . Probable  volume   of  gases passing through boiler per second, cu m at zero and 760mm ................
	9.74
	25.00 10.35
	2.00 15.50
	13.00 15.50
	51.00 24.60

* Boilers all Babcock & Wilcox type.